I think I should clarify some things about the poll.
First, there is no wrong or right answer, the answer should reflect your family's sense of self and ethnicity regarding their McCain kin. All three answers are correct.
You should tick the one you feel most comfortable using in describing your your McCains.
All of the our McCains have ancestors that lived in Ireland, indeed, many that have tested still live there. But most of the McCains I've talked with also have an oral history of links to Argyll, in Scotland. This oral history has been supported by multiple DNA matches to mid Argyll in the last couple of years.
When you go to the McCain DNA Project results you will notice several non McCain matches, the MacLea family for instance, is from Argyll, from the island of Bute. The Duncan family is also from Argyll. We think the Henry family is also from Argyll, still working on confirming that one however.
So again, there is no right or wrong answer, just put what you honestly thing about your McCains ethnicity.
And many thank yous to all the McCains taking time out to help us with this poll.